Screen or separator.



T. L. STURTEVANT. SCREEN 0R SEPARATOR.

APPLICATION FILED NOV Patented-Am 6, 1915 2 SHEETS-SHEET 1.

T. L. STURTEVANT. SCREEN OR SEPARATOR. APPLICATION FILED NOV. 14, 1914.

Patented Apr. 6, 1915.

2 sums-sum z.

ring means.

OMASJ LEGG-ETT STURTEVANT, OF QUINCY, MASSACHUSETTS, ASSIGNOR TSTURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

SGREEN OR SEPARATOR.

Patented Apr. 6, 11935.

Application filed November 14, 1914. Serial No. 872,138.

To all whom it may concern:

Be it known that l, THOMAS L. STURTE- vANr, a citizen of the UnitedStates, residing at Quincy, in the county of Norfolk and State ofMassachusetts, have invented or discovered certain new and usefulImprovements in Screens or Separators, of which the following is aspecification, reference being bad therein to the accompanying drawings.

This invention relates to screens or separators, and more particularlyto that class in which the screens are percussively jarred by means ofvibrating hammers acting indirectly on the screens.

The present invention has for its object to provide means whereby thescreens will be so mounted or hung that the jarring or vibrating actionwill be efiective, the screens preferably being of such constructionthat they may be readily dismounted when necessary, and when dismountedmay be rolled up so as to be in compact form for convenienttransportation.

In the accompanying drawings Figure 1 is a side view of a separatorembodying the resent invention. Fig. 2 is a sectional view illustratinga preferred manner of mounting the screens and suitable means forpercussively jarring the same. Fig. 3 is a detail sectional view showinga modified construction of sieve mounting and suitable jar- Fig. 4 is anenlarged detail View of a portion of the screen mounting '13 preferablyof sheet steel.

construction shown in Fig. 2. Fig. 5 illustrates a modified form of themounting shown in Fig. 4, and Fig. 6 shows still another form of screenmounting.

Referring to the drawings, 12 denotes frame parts of the separatorsupporting an inclined box or casing comprising side walls To said sidewalls or casing, within the chamber of the separator are attachedelastic or resilient metallic curtains 14 also preferably ,of sheetsteel, these curtains 14 inclining inward downwardly so that their loweredges are at a considerable distance from the separator-side walls 13.The curtains 14 are provided at their lower ends with horizontal flanges15 to which the screen clothing 16 may be attached either directly, asby rivets, or indirectly. In the construction shown in Fig. 2 the screenclothing is attached to strengthening side bars 17, by rivets orotherwise, the said side bars being provided with pins 18 passingthrough holes in the flanges 15 of the curtains 14, so that the screensmay be readily removed or dismounted from the said supporting flanges,and when thus removed or dismounted may be rolled up for convenienttransportation. Instead of providing the bars 17 with pins 18 the saidpins may be secured to the flanges Lfi of the curtains 14, as shown inthe detail view Fig. 5, this construction also enabling the screens tobe readily dismounted from thesaid curtains 14 and to be rolled up forconvenient transportation.

In the construction shown in Fig. 3 the curtains 14 are supported byblocks or bars 19 which are preferably removably attached tothe sides 13of the separator frame, and in this construction the screen clothing 16is riveted or otherwise directly attached to the flanges 15 of thecurtains 14.

In order that the screen clothing 16 may be drawn taut, as is necessaryfor the best practical use, the curtains 14 are connected with the sidewalls 13 of the separator frame by means of stretching bolts 20 theheads of which are on the insides of the curtains 13, said bolts beingprovided on the outsides of the separator walls 13 with adjusting nuts21 which may be turned for the purpose of stretching the screen clothingtaut. The bolts 20 are preferably provided with inside locking nuts 22.V

The screens hung in the chamber of the separator in the mannerhereinbefore described may be jarred or vibrated in any suitable manner,as, for example, by jarring mechanism such as that shown and describedin the Sturtevant Patents, Nos. 1,035,262 and 1,114,064, this jarringmechanism, as hercinbefore shown, comprisingimpact bars 24 acted on byvibrating hammers 25 which are lifted by rollers carried by rotatingarms 27, the rollers 26 being so arranged as to lift the free ends ofthe vibrating hammers and then release the same so that they may fall bygravity. Any other suitable mechanism for ciently long and heavy toeflfect proper action by gravity, or they may be especially weighted, ifdesired, and said hammers may be prevented from jumping by stops, as 32.

In the practical use of the invention two or more screens, 2) willpreferably be employed, the upper screen being preferably of coarsermesh than the lower screen, as is usual in separators of the class towhich the invention relates. \Vith such an arrangement of screens theimpact barsQt. may act directly or indirectly on the upper screen, andthe jarring of the impact bars may be imparted to the lower screenthrough spacing blocks, as 31.

From the foregoing it will be understood that the invention, in itspreferred form, provides elastic sidejsupports or curtains for thescreens, said curtains, the lower edges of which are spaced apart fromthe side wallsof the separator, affording convenient means whereby thescreen clothing may be stretched taut; While in the preferred form ofthe invention the screens are preferably removably mounted on the saidelastic curtains so that they may be conveniently placed in position ormay be dismounted and when in dismounted condition may be rolled up withsaid side bars for compactness and convenience in transportation. Itwill .also be understood that the curtains 14 not only serve asconvenient means for sus ending the screens in such a manner that t eyare free to be percussively vibrated or jarred, but also serve asshields to prevent the material which is being screened from escapingfrom the sides of the screens.

While two curtainsor shields l 'l, one at each side of the separator,and both of which are provided with stretching bolts 20 for drawing thescreen clothing taut, will preferably be employed, it will be within thepresent invention to use one yielding curtain or shield and one set ofadjustable bolts 20 to enable the screen clothing to be properlystretched, as illustrated in Fig. 6, which shows one side of the screenclothing 6 attached to an angle iron or, bracket 33 bolted at 34 to aside wall 13 of the separator box or casing.

By the arrangement of the hammers shown in Fig. 3-

a crosswise jarring of the be effected, which is very advantageous insifting some kinds of materials.

The invention is not to be understood as being limited to the detailsherein shown, as such details may be varied widely within the limits ofmechanical skill without departing from the invention. While thesuspending curtains or shields will preferably be of sheet steel orother resilient metal, they may, if desired, beof' other and somewhatstifl but flexible or elastic material, as thin one above the other (seeFig.-

- said screen clothing,

sheets of hard wood, which will serve a good purpose under somecircumstances.

Having thus described my invention I claim and desire to secure byLetters Patent:

1. In a separator, the combination with the side walls thereof, offlexible or elastic shields or curtains suspended from said side walls,wire mesh screen clothing supported by said shields or curtains, andadjustable means, acting through said shields or curtains, forstretching the wire mesh screen clothing.

2. In a separator, the combination with the side walls thereof, ofspring-metal shields or curtains suspended from said side walls, ascreen comprising wire mesh screen clothing supported by said shields orourtains, adjustable means, acting through said shields or curtains, forstretching the wire mesh screen clothing, and means for percussivelyjarring the screen.

3. In a separator, the combination with i the side walls thereof, ofspring metal curtains suspended from said side walls, a plurality ofsuperposed screens, comprising wire mesh screen clothing, supported bysaid curtains, and adjustable means for stretching the said screenclothing.

4:- In a separator, the combination with the side walls thereof, ofinclined spring metal curtains suspended from said side walls, aplurality of superposed screens comprising wire mesh screen clothingsupported by said curtains, means for stretching the and means forpercus sively jarring said screens.

5. In a separator, the combination with the side walls thereof, ofspring sheet metal curtains suspended from said side walls and providedat their free lower edges with inwardly extending horizontal flanges,and Wire mesh screen 010 hing supported by said flanges.

6. In a separator, the combination with the side walls thereof, ofelastic metallic curtains suspended from said side walls and provided attheir free lower edges with inwardly extending horizontal flanges, andscreens, comprising strengthening side-bars and wire mesh screenclothing, said flanges.

7. In a separator, the combination with the sidewalls thereof, ofcurtains suspended from said side walls and provided at their free loweredges with horizontal flanges, and wire mesh screen clothing removablymounted on said flanges.

8. In a separator, the combination with the side walls thereof, of anelastic metallic curtain suspended at its upper edgefrom one of saidside walls, with its free lower edge, which is provided with an inwardlyextending flange, separated therefrom, a screen comprising wire meshscreen clothing 7 ing, connected at one 1,13%,ldd

attached at one side to said flange, means for holding the other side ofsaid clothing, and means, acting through said curtain, for stretchingsaid Wire mesh screen clothing.

9 In a separator, the combination with the side Walls thereof, of anelastic metallic curtain suspended at its upper edge from one of saidside Walls, with its free lower edge, which is provided with an inwardlyexending flange, separated therefrom, a screen, comprising wire meshscreen clothing, attached at one side to said flange, means for holdingthe other side of said clothing, means, acting through said ourtains,for stretching said wire mesh screen clothing, and means forpercussively jarring the said screen.

10. In a separator, the combination with the side walls thereof, of ametallic curtain suspended from one of said side walls with its freelower edge separated therefrom, a screen, comprising wire mesh screenclothside with said free lower edge of said curtain, means for holdingthe other side of said clothing, means, acting through said curtain, forstretching said wire mesh screen clothing, and means, acting crosswiseof said screen, for percussively jarring the same.

lln a separator, the combination with the side walls thereof, ofsuspended shields or curtains connected at their upper edges with saidside walls and having their free lower edges separated from said walls,screens, comprising wire mesh screen clothing, connected with the lowerparts of said shields or curtains, means for drawing the lower edges ofsaid shields or curtains apart, so as to stretch said screen clothing,and means, acting crosswise of said screen, for

. percussively jarring the same.

lln testimony whereof I afiin my signature, in presence of twowitnesses.

Witnesses;

EVA W. WHITE, l B, Hnsnnn,

